n=2的一些解决方案:
..1....3....1....2....0....0....1....0....1....2....2....0....3....1....3....0
..1....0....0....3....1....2....0....2....3....3....3....3....3....1....0....1
..0....3....1....3....1....1....2....0....1....1....0....0....0....0....1....2
..2....2....2....1....3....1....1....1....2....0....1....3....2....3....3....3
..3....0....3....0....2....0....2....1....0....3....3....2....2....2....2....1